Moisture management
Can support protein water binding in suitable meat, poultry and seafood recipes. Assess cooking loss or thaw drip in the actual process.
Food phosphate · INS 451(i) · STPP
Food Grade Sodium Tripolyphosphate
Bespring supplies food-grade sodium tripolyphosphate (STPP) as white powder or granules for moisture and texture control in meat, poultry and seafood processing. Select the physical form and food standard for your process, then use the reference specifications below to prepare a bulk inquiry for your destination market.
- CAS number
- 7758-29-4
- INS number
- 451(i)
- Formula
- Na5P3O10
- Reference assay
- ≥ 85.0%
Product illustration · grade and packaging specified in your offer
Include required standard, quantity, pallet preference, destination and application for an efficient review.
Reference specificationCommercial limits and test-method requirements
25 kg packagingKraft paper outer bag with inner PE bag
24-month shelf lifeFrom manufacturing date under stated storage
Container optionsWith or without pallets
Product overview
What is food grade STPP?
Sodium tripolyphosphate (STPP), also called pentasodium triphosphate, is the pentasodium salt of triphosphoric acid, identified as CAS 7758-29-4 and INS 451(i). Its anhydrous formula is Na5P3O10. The JECFA monograph distinguishes anhydrous STPP from its hexahydrate; the assay and phosphorus limits on this page refer to the anhydrous material.
For procurement, “food grade” should never be treated as the whole specification. Buyers should also confirm assay, P2O5, insoluble matter, contaminant limits, particle form, test methods and destination-market documentation.
Procurement snapshot
- Product
- Sodium tripolyphosphate
- Synonyms
- Pentasodium triphosphate; sodium triphosphate
- Appearance
- White granules or powder
- Anhydrous formula weight
- 367.86 g/mol
- JECFA reference pH
- 9.1–10.1 (1% solution)
- Standard pack
- Net 25 kg bag
Formulation value
Why is STPP used in food processing?
STPP functions depend on the food system. The FDA substance record lists emulsifier, pH-control, sequestrant and texturizer roles; actual performance depends on the recipe, raw material, process and use level.
Texture & pH control
Can modify texture and help control pH. Check finished-product pH and sensory quality rather than assuming a fixed buffering effect.
Emulsification
Can support protein dispersion and fat–water emulsion stability in suitable formulations; it is not a universal emulsifier for every food.
Sequestration
Complexes certain metal ions, including calcium and magnesium. Water hardness and other ingredients influence this sequestration function.
Typical application areas
Food grade STPP applications
The intended food category, dosage and declaration must be reviewed against the regulations of the manufacturing and destination markets.
Meat, poultry & seafood
STPP is considered in validated brines, marinades and processed protein systems where moisture retention, texture and process yield are important.
- Processed meat and poultry products
- Selected fish and seafood products
- Brine and phosphate blend systems
- Trial checks: brine clarity, uptake, purge, cooking loss and texture
For STPP in meat processing, review our brine and process considerations. For fish and shellfish, use the seafood phosphate selection guide.
Processed cheese & formulated products
STPP may be considered as part of an emulsifying-salt or phosphate system in suitable dairy and formulated-food applications. Select the phosphate combination for the specific protein, mineral balance and heating process.
- Selected processed-cheese applications
- Emulsified or formulated food systems
- Compound phosphate blends
Product specification
Food grade sodium tripolyphosphate specification
The following limits are commercial references for the offered grade. They are not a universal definition of food grade STPP; the signed specification, agreed test methods and batch COA govern an order.
Swipe or use the keyboard to read all columns
| Test item | Specification | Unit / basis |
|---|---|---|
| Assay (Na5P3O10) | ≥ 85.0 | % |
| P2O5 | 56.0–58.0 | % |
| Water-insoluble matter | ≤ 0.1 | % |
| Fluoride | ≤ 50 | ppm |
| Arsenic | ≤ 3 | ppm |
| Heavy metals | ≤ 10 | ppm |
| Lead | ≤ 4 | ppm |
| Appearance | White granules or powder | Visual |
Units and test basis: For mass-based reporting, 1 ppm = 1 mg/kg. Confirm fluoride is reported as fluorine when comparing standards. Analytical methods and the reporting basis for “heavy metals” need to be defined. Agree methods, sampling and acceptance criteria in a signed specification; use the batch COA to check actual results.
Standard comparison: The commercial fluoride limit of ≤ 50 ppm equals the ≤ 50 mg/kg limit in the cited JECFA monograph. The EU E451(i) specification instead sets ≤ 10 mg/kg, expressed as fluorine: the listed commercial limit is less stringent. Matching selected JECFA limits does not establish full conformance; identification, loss on drying, higher polyphosphates and prescribed methods also require review.
Chemical identity and market requirements
JECFA identifies STPP as INS 451(i), with sequestrant and texturizer functions. In the EU it is designated E451(i). These identifiers describe the additive; they do not establish that a supplied grade meets a particular standard or is permitted in every food. Check the applicable food category, use limit, labeling rules and complete purity specification for the destination market. The FDA inventory links to U.S. regulatory provisions and does not certify Bespring’s product.
Supplier qualification
What to confirm before buying food grade STPP
A useful quotation should identify the exact grade and acceptance criteria—not only the abbreviation “STPP.”
Identity & food standard
Confirm sodium tripolyphosphate, CAS 7758-29-4, INS/E451(i), the required food standard and intended destination market.
Specification & methods
Align assay, P2O5, insoluble matter, contaminants, units, sampling and analytical methods.
Form & process fit
State powder or granular preference, application and recipe conditions. If handling or hydration rate matters, also define particle size, bulk density and phase-composition requirements.
Documents & logistics
Request a current signed specification, TDS, SDS and a representative COA for qualification; require a COA for the supplied batch. Confirm packaging, pallets, quantity, destination and any certificate scope.
Grade boundary: Food grade and technical or detergent grades should not be treated as interchangeable. Qualify the grade, facility documentation and intended legal use before approval.
Packing & logistics
STPP packaging and container loading
Final loading depends on container limits, route, pallet dimensions and shipping requirements.
- Standard packagingNet 25 kg per bag; outer kraft paper bag with inner PE bag.
- Without palletsReference load: 23 MT per 20-foot general-purpose container.
- With palletsReference load: 18 MT per 20-foot general-purpose container.
Storage & shelf life
Keep STPP dry and segregated
- Warehouse conditionsStore in a ventilated, dry, shaded and cool warehouse.
- SegregationDo not store or transport together with poisonous materials.
- Shelf life24 months from the manufacturing date under the specified storage conditions.
Related selection resources
Compare food phosphates and application guidance
Use these pages to compare adjacent ingredients and narrow the application before supplier qualification.
Related productSodium Hexametaphosphate (SHMP)Compare another sequestrant and functional phosphate.Related productTetrasodium Pyrophosphate (TSPP)Review identity and commercial reference specification.Related productFood Phosphate BlendsExplore application-specific multi-phosphate systems.Application guideSTPP in Meat ProcessingReview formulation variables and process considerations.Solution guideSeafood Phosphate SelectionStructure a seafood-focused phosphate brief.Buyer guideSTPP vs SHMPCompare identity, function and procurement questions.
Buyer questions
Food grade STPP FAQ
What is food grade STPP used for?
It is used in permitted food applications where phosphate functionality is needed, including selected meat, poultry, seafood, dairy and processed-food formulations. The precise function and use level depend on the recipe, process and local regulations.
What is the food additive number for sodium tripolyphosphate?
STPP is identified as INS 451(i) and, in the EU, E451(i), pentasodium triphosphate. An additive number identifies the substance; permitted foods, use limits and purity requirements must be checked separately.
Is this specification the same as a batch COA?
No. This page presents the commercial reference limits. A certificate of analysis reports results for a particular batch and should be checked against the agreed purchase specification.
Does the reference specification shown here conform to JECFA?
The listed fluoride limit, ≤ 50 ppm, matches the cited JECFA limit of ≤ 50 mg/kg. However, this abbreviated commercial table cannot establish full JECFA conformance. Review the complete signed specification, prescribed methods and batch COA. EU E451(i) has a stricter fluoride limit of ≤ 10 mg/kg. See the official sources beside the specification table.
Are food grade and industrial grade STPP interchangeable?
No. The same chemical name does not establish suitability for food use. Confirm the offered grade, specification, supporting documentation, manufacturing controls and regulatory suitability for the intended market.
How is food grade STPP packed and loaded?
Standard packing is a net 25 kg kraft paper outer bag with an inner PE bag. Reference loading is 23 MT per 20GP without pallets or 18 MT with pallets, subject to shipment confirmation.
What information is needed for an STPP quotation?
Provide the required food standard, powder or granular preference, quantity, packaging, pallet requirement, destination port, application and delivery target.
How should I select STPP for a brine?
Specify powder or granules and your brine concentration, water hardness, mixing temperature and process. Compare dissolution and brine clarity under those conditions, then evaluate uptake, purge, cooking loss and texture in a trial. If needed, agree particle-size and phase-composition requirements before ordering.
Can I request product documents or a sample?
Ask the sales team for the specification, TDS, SDS, applicable quality documents and sample availability. State your application and destination so the relevant documents can be reviewed.
Start a sourcing conversation
Request an STPP quote
Request a quotation, current technical documents or sample availability. Include the details below so our team can match the grade and prepare the shipping proposal.
- Required food standard and particle form
- Quantity, packaging and pallet preference
- Destination country or port
- Application and delivery timing
Product documents
Request documents
Tell us your grade and destination market so we can confirm which documents are available for your order.
An external reference is not a batch certificate or a Bespring product specification.